I run the 0w-30 in 2 Saab turbos, 1 Volvo turbo, and a Dodge 350 van. My kids run 0w-30 in 3 Volvos, 2 Saabs, 1 Subaru.
When the 0W-30 became available, years back, my son-in-law changed from AMSOIL 10w-30 to the 0W-30. Called me a couple months later to say he was getting 50-75 miles more per tankful before the red light came on telling him to get gas.
I move about as much 0w-30 as 5W-30 and 10W-30 combined (except to shops)